Method for improving surface oxidation resistance of aluminum alloy

Abstract

The invention provides a method for improving surface oxidation resistance of an aluminum alloy, and belongs to the technical field of casting of aluminum alloys. The method comprises the steps of: surface treatment, injection of yttrium, nickel and indium ions, high-temperature curing, spraying of a surface treatment agent and medium-temperature curing. Compared with the prior art, the method selects yttrium, nickel and indium elements as injecting elements, so that the surface oxidation resistance of a magnesium alloy is effectively improved; meanwhile, the surface treatment agent is sprayed to the surface of the aluminum alloy, so that a film formed on the surface is thick and environment-friendly; the film layer is compact and uniform; the density of polarization current is lower; and the film is excellent in corrosion resistance, high in oxidation resistance and lasting in protectiveness. The method is simple in process, wide in application range, capable of modifying the surfaces of the aluminum alloys with various types and free of the environmental pollution problem.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy casting, and in particular relates to a method for improving the oxidation resistance of the aluminum alloy surface. Background technique [0002] Aluminum alloy is a commonly used non-ferrous metal with a wide range of uses. Due to the rapid oxidation of aluminum alloy in the high-temperature liquid state during melting and casting, the surface of the casting after casting is dark, with low density and poor quality. The surface of aluminum alloy needs to be treated. There are many surface treatment methods for aluminum alloys, such as physical methods, chemical methods, physicochemical methods, and comprehensive methods. The commonly used method is anodic oxidation method, which forms a conversion film on the surface of aluminum alloy by electrochemical method. Although this method can improve the oxidation resistance of aluminum alloy, its ability to adapt to the environment is poor, and ...

AI Technical Summary

Problems solved by technology

The commonly used method is anodic oxidation method, which forms a conversion film on the surface of aluminum alloy by electrochemical method. Although this method can improve the oxidation resistance of aluminum alloy, its ability to adapt to the environment is poor, and the conversion film layer is not uniform enough and easy to fall off. , the wear resistance has not been improved, and the traditional phosphate conversion and chromate passivation surface treatment technology can obtain good results, but the waste liquid discharged during the treatment process contains heavy metal ions such as zinc, manganese, nickel, chromium, etc. Carcinogens such as anti-oxidation and anti-oxidation are very serious to the environment, and the metal surface silanization treatment technology is considered to be expected to replace phosphate conversion treatment and chromium because it does not involve substances that are harmful to the environment, the production process has low energy consumption, and the technology has a wide range of applications. Salt passivation treatment is the latest development direction of metal surface protection alone